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Many thanks to Daniel Greenfeld, James Aylett, Marc Tamlyn, Simon Williams, Danilo Bargen and Luke Plant for their work on this.
257 lines
9.0 KiB
Plaintext
257 lines
9.0 KiB
Plaintext
=================
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Date-based mixins
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=================
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.. class:: django.views.generic.dates.YearMixin
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A mixin that can be used to retrieve and provide parsing information for a
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year component of a date.
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**Methods and Attributes**
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.. attribute:: year_format
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The :func:`~time.strftime` format to use when parsing the year.
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By default, this is ``'%Y'``.
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.. attribute:: year
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**Optional** The value for the year (as a string). By default, set to
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``None``, which means the year will be determined using other means.
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.. method:: get_year_format()
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Returns the :func:`~time.strftime` format to use when parsing the year. Returns
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:attr:`YearMixin.year_format` by default.
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.. method:: get_year()
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Returns the year for which this view will display data. Tries the
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following sources, in order:
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* The value of the :attr:`YearMixin.year` attribute.
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* The value of the `year` argument captured in the URL pattern
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* The value of the `year` GET query argument.
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Raises a 404 if no valid year specification can be found.
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.. class:: django.views.generic.dates.MonthMixin
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A mixin that can be used to retrieve and provide parsing information for a
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month component of a date.
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**Methods and Attributes**
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.. attribute:: month_format
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The :func:`~time.strftime` format to use when parsing the month. By default, this is
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``'%b'``.
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.. attribute:: month
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**Optional** The value for the month (as a string). By default, set to
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``None``, which means the month will be determined using other means.
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.. method:: get_month_format()
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Returns the :func:`~time.strftime` format to use when parsing the month. Returns
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:attr:`MonthMixin.month_format` by default.
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.. method:: get_month()
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Returns the month for which this view will display data. Tries the
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following sources, in order:
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* The value of the :attr:`MonthMixin.month` attribute.
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* The value of the `month` argument captured in the URL pattern
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* The value of the `month` GET query argument.
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Raises a 404 if no valid month specification can be found.
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.. method:: get_next_month(date)
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Returns a date object containing the first day of the month after the
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date provided. Returns ``None`` if mixed with a view that sets
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``allow_future = False``, and the next month is in the future. If
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``allow_empty = False``, returns the next month that contains data.
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.. method:: get_prev_month(date)
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Returns a date object containing the first day of the month before the
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date provided. If ``allow_empty = False``, returns the previous month
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that contained data.
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.. class:: django.views.generic.dates.DayMixin
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A mixin that can be used to retrieve and provide parsing information for a
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day component of a date.
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**Methods and Attributes**
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.. attribute:: day_format
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The :func:`~time.strftime` format to use when parsing the day. By default, this is
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``'%d'``.
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.. attribute:: day
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**Optional** The value for the day (as a string). By default, set to
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``None``, which means the day will be determined using other means.
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.. method:: get_day_format()
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Returns the :func:`~time.strftime` format to use when parsing the day. Returns
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:attr:`DayMixin.day_format` by default.
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.. method:: get_day()
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Returns the day for which this view will display data. Tries the
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following sources, in order:
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* The value of the :attr:`DayMixin.day` attribute.
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* The value of the `day` argument captured in the URL pattern
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* The value of the `day` GET query argument.
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Raises a 404 if no valid day specification can be found.
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.. method:: get_next_day(date)
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Returns a date object containing the next day after the date provided.
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Returns ``None`` if mixed with a view that sets ``allow_future = False``,
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and the next day is in the future. If ``allow_empty = False``, returns
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the next day that contains data.
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.. method:: get_prev_day(date)
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Returns a date object containing the previous day. If
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``allow_empty = False``, returns the previous day that contained data.
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.. class:: django.views.generic.dates.WeekMixin
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A mixin that can be used to retrieve and provide parsing information for a
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week component of a date.
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**Methods and Attributes**
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.. attribute:: week_format
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The :func:`~time.strftime` format to use when parsing the week. By default, this is
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``'%U'``.
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.. attribute:: week
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**Optional** The value for the week (as a string). By default, set to
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``None``, which means the week will be determined using other means.
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.. method:: get_week_format()
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Returns the :func:`~time.strftime` format to use when parsing the week. Returns
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:attr:`WeekMixin.week_format` by default.
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.. method:: get_week()
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Returns the week for which this view will display data. Tries the
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following sources, in order:
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* The value of the :attr:`WeekMixin.week` attribute.
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* The value of the `week` argument captured in the URL pattern
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* The value of the `week` GET query argument.
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Raises a 404 if no valid week specification can be found.
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.. class:: django.views.generic.dates.DateMixin
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A mixin class providing common behavior for all date-based views.
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**Methods and Attributes**
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.. attribute:: date_field
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The name of the ``DateField`` or ``DateTimeField`` in the
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``QuerySet``'s model that the date-based archive should use to
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determine the objects on the page.
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When :doc:`time zone support </topics/i18n/timezones>` is enabled and
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``date_field`` is a ``DateTimeField``, dates are assumed to be in the
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current time zone. Otherwise, the queryset could include objects from
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the previous or the next day in the end user's time zone.
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.. warning::
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In this situation, if you have implemented per-user time zone
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selection, the same URL may show a different set of objects,
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depending on the end user's time zone. To avoid this, you should
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use a ``DateField`` as the ``date_field`` attribute.
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.. attribute:: allow_future
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A boolean specifying whether to include "future" objects on this page,
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where "future" means objects in which the field specified in
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``date_field`` is greater than the current date/time. By default, this
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is ``False``.
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.. method:: get_date_field()
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Returns the name of the field that contains the date data that this
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view will operate on. Returns :attr:`DateMixin.date_field` by default.
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.. method:: get_allow_future()
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Determine whether to include "future" objects on this page, where
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"future" means objects in which the field specified in ``date_field``
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is greater than the current date/time. Returns
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:attr:`DateMixin.allow_future` by default.
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.. class:: django.views.generic.dates.BaseDateListView
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A base class that provides common behavior for all date-based views. There
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won't normally be a reason to instantiate
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:class:`~django.views.generic.dates.BaseDateListView`; instantiate one of
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the subclasses instead.
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While this view (and it's subclasses) are executing, ``self.object_list``
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will contain the list of objects that the view is operating upon, and
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``self.date_list`` will contain the list of dates for which data is
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available.
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**Mixins**
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* :class:`~django.views.generic.dates.DateMixin`
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* :class:`~django.views.generic.list.MultipleObjectMixin`
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**Methods and Attributes**
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.. attribute:: allow_empty
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A boolean specifying whether to display the page if no objects are
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available. If this is ``True`` and no objects are available, the view
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will display an empty page instead of raising a 404. By default, this
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is ``False``.
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.. method:: get_dated_items():
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Returns a 3-tuple containing (``date_list``, ``object_list``,
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``extra_context``).
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``date_list`` is the list of dates for which data is available.
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``object_list`` is the list of objects. ``extra_context`` is a
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dictionary of context data that will be added to any context data
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provided by the
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:class:`~django.views.generic.list.MultipleObjectMixin`.
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.. method:: get_dated_queryset(**lookup)
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Returns a queryset, filtered using the query arguments defined by
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``lookup``. Enforces any restrictions on the queryset, such as
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``allow_empty`` and ``allow_future``.
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.. method:: get_date_list(queryset, date_type)
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Returns the list of dates of type ``date_type`` for which
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``queryset`` contains entries. For example, ``get_date_list(qs,
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'year')`` will return the list of years for which ``qs`` has entries.
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See :meth:`~django.db.models.query.QuerySet.dates()` for the
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ways that the ``date_type`` argument can be used.
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